Instruction manual

18
Table 4 Water Quality Guidelines
*If the concentration of these corrosives exceeds the maximum allowable level, then the potential for serious corrosion
problems exists.
Sulfides in the water quickly oxidize when exposed to air, requiring that no agitation occur as the sample is taken.
Unless tested immediately at the site, the sample will require stabilization with a few drops of one Molar zinc acetate
solution, allowing accurate sulfide determination up to 24 hours after sampling. A low pH and high alkalinity cause sys-
tem problems, even when both values are within ranges shown. The term pH refers to the acidity, basicity, or neutrality
of the water supply. Below 7.0, the water is considered to be acidic. Above 7.0, water is considered to be basic. Neutral
water contains a pH of 7.0.
NOTE: To convert ppm to grains per gallon, divide by 17. Hardness in mg/l is equivalent to ppm.
POWER CONNECTION — Make line voltage connection
by connecting the incoming line voltage wires to the L side
of the CC terminal as shown in Fig. 21. See Tables 5-7 for
correct wire and maximum overcurrent protection sizing.
SUPPLY VOLTAGE Operating voltage to unit must be
within voltage range indicated on unit nameplate.
On 3-phase units, voltages under load between phases must
be balanced within 2%. Use the following formula to deter-
mine the percentage voltage imbalance:
% Voltage Imbalance
Example: Supply voltage is 460-3-60.
AB = 452 volts
BC = 464 volts
AC = 455 volts
Determine maximum deviation from average voltage:
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance.
= 1.53%
This amount of phase imbalance is satisfactory as it is
below the maximum allowable 2%.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to electri-
cal components.
NOTE: If more than 2% voltage imbalance is present, contact
local electric utility.
208-VOLT OPERATION — All 208-230 volt units are factory
wired for 208 volts. The transformers may be switched to
230-volt operation by switching the red (208 volt) wire with
the orange (230 volt) wire at the L1 terminal.
PSC (PERMANENT SPLIT CAPACITOR) BLOWER SPEED
SELECTION All Water Source Heat Pumps are factory set
to deliver rated airflow at nominal static (0.15 in. wg) on
medium speed. Where higher static is needed, high speed
can be utilized (0.4 to 0.5 in. wg). Low speed will deliver
approximately 85% of rated airflow (0.10 in. wg). The PSC
blower fan speed can be changed on all units by swapping
wires connected to the relay contacts that control the fan. See
Tables 8-10.
For 50RHR,RVR,RHS,RVS and RDS Units
— On the con-
trol, the black wire is connected to High, blue wire is connected
to Medium and red wire is connected to Low. See Fig. 19, 20
and 22.
NOTE: Available airflows for all units are shown in Tables 8-10.
For 50RHC,RVC Units
— PSC blower fan speed can be
changed by moving the blue wire on the fan motor terminal
block to the desired speed as shown in Fig. 22. The
50RHC,RVC units are designed to deliver rated airflow at
nominal static (0.15 in. wg) on medium speed (factory setting)
and rated airflow at a higher static (0.4 to 0.5 in. wg) on high
speed for applications where higher static is required. Low
speed will deliver approximately 85% of rated airflow at
0.10 in. wg. An optional ‘High Static’ blower is available by
using the special option code in the model nomenclature.
CONDITION ACCEPTABLE LEVEL
pH
7 to 9 range for copper. Cupronickel may be used in the 5 to 9 range.
Total Hardness
Calcium and magnesium carbonate should not exceed 20 grains per gallon (350 ppm).
Iron Oxides
Less than 1 ppm.
Iron Bacteria
No level allowable.
Corrosion*
Max Allowable Level Coaxial Metal
Ammonia, Ammonium Hydroxide 0.5 ppm Cu
Ammonium Chloride, Ammonium Nitrate 0.5 ppm Cu
Ammonium Sulfate 0.5 ppm Cu
Chlorine/Chlorides 0.5 ppm CuNi
Hydrogen Sulfide None Allowable
Brackish
Use Cupronickel heat exchanger when concentrations of calcium or sodium chloride are greater
than 125 ppm are present. (Seawater is approximately 25,000 ppm.)
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
= 457
% Voltage Imbalance = 100 x
7
457